package com.wpp.coder;

import com.wpp.serializer.Serializer;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

/**
 * @author by wpp25
 * @Classname RpcEncoder
 * @Description
 * @Date 2020/11/26 20:11
 */
public class RpcEncoder extends MessageToByteEncoder {

    private Class<?> clazz;

    private Serializer serializer;

    public RpcEncoder(Class<?> clazz, Serializer serializer) {
        this.clazz = clazz;
        this.serializer = serializer;
    }

    @Override
    protected void encode(ChannelHandlerContext channelHandlerContext, Object msg, ByteBuf byteBuf) throws Exception {
        if (clazz != null && clazz.isInstance (msg)) {
            byte[] bytes = serializer.serialize(msg);
            byteBuf.writeInt(bytes.length);
            byteBuf.writeBytes(bytes);
        }
    }
}
